Xmpp ios中的策略违规错误?

嗨我正在与xmpp framework.every事情正常工作,直到昨天。但突然我面临下面的错误然后服务器断开连接

<stream:error xmlns:stream="http://etherx.jabber.org/streams"><policy-violation xmlns="urn:ietf:params:xml:ns:xmpp-streams"/></stream:error> 

为什么我收到这个错误。请问如果有任何机构知道帮助我。提前感谢,也得到了下面的错误

 SEND: <iq type="error" to="manager.ip-1-148" id="30-22829"><query xmlns="jabber:iq:version"/><error type="cancel" code="501"><feature-not-implemented xmlns="urn:ietf:params:xml:ns:xmpp-stanzas"/></error></iq> 2016-06-08 03:16:00:834[12715:9b03] RECV: <message xmlns="jabber:client" from="manager.ip--148" to="919553@ip-172-148/Smack"><body>You are using an invalid client, and therefore will be disconnected. Please ask your system administrator for client choices.</body></message>